Composite samples

Xem 1-20 trên 51 kết quả Composite samples
  • Failure to adequately define [sample] support has long been a source of confusion in site characterization and remediation because risk due to long-term exposure may involve areal supports of hundreds or thousands of square meters; removal by backhoe or front-end loader may involve minimum remediation units of 5 or 10 m2; and sample measurements may be taken on soil cores only a few centimeters in diameter. (Englund and Heravi, 1994) The importance of this observation cannot be overstated.

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  • The present paper provides the results of our analysis on the composition and distributional characteristics of decapod crustaceans and molluscs in waterbodies in Xuan Son NP based on the samples from recent field surveys.

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  • Phytoplankton and water samples were repeatedly collected in November 2015; February and May 2016 from 12 sampling sites in Truc Bach lake. 115 species and subspecies of phytoplankton had been recorded. In order to assess this problem, in this study, we investigated the phytoplankton communities and the water quality from Truc Bach lake.

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  • Eight students in this study achieved an increase in their Overall score from Test 1 to Test 2 of one whole band and a further 14 achieved a half band increase. In other words, just over half of this sample of 40 students were able to achieve a better result in the IELTS Test when taken again after two or three years of higher education in Australia. A total of 12 students achieved the same Overall score in Test 2 as in Test 1, and six students actually regressed, dropping a half band. Of course, this is not to say...

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  • Tham khảo bài thuyết trình 'phân tích polyme (polymer analysis)', kỹ thuật - công nghệ, hoá học - dầu khí phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • With respect to the sampling of tomato it occurred at the beginning, on the highest peak and at the end of the production stage of tomato. For each sampling unit a zigzag path by the crop was followed, harvesting a tomato every three places along the zig-zag, and then based on a quartering system, obtaining a sample of 1 kg per plot.

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  • In the case of Writing and Speaking, however, the small increases in the mean scores did not reflect a significant improvement. For Writing, the sample mean of 6.33 (SD = .64) was not significantly different from 6.21, t(39) = -0.95, p .05. Likewise, for Speaking, the sample mean of 6.66 (SD = .78) was not significantly different from 6.50, t(39) = -1.25, p .05. The results of the paired sample t-test conducted on the Overall score did, however, indicate an improvement. The sample mean of 7.01 (SD = .49) was significantly different from 6.71, t(39) = -3.86, p...

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  • Some flow cytometers have the ability to physically separate different sub-populations of interest (cell sorting) depending on their cytometric characteristics (stream-in-air), thus permitting the recovery and purification of cell subsets from a mixed population for further applications (Bergquist et al., 2009; Davey, 2010).

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  • A questionnaire was applied including variables social, demographic, occupational, clinical, toxicological and tomatoes consumption habits. The pilot study was carried out on 10% of the total of the sample, although they did not make part of the research. Following the criteria of inclusion, all laborers engaged in tomato planting entered into the study, provided that they were permanent residents in the community, who had used OF, C and OC pesticides at least during the six months previous to the study, and also who volunteered to participate in the study....

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  • Subsequently, the 1996 Nepal Family Health Survey, the 2001 Nepal Demographic and Health Survey and the 2006 Nepal Demographic and Health surveys were conducted. This trend report discusses key findings from these three DHS surveys in Nepal. All three Nepal DHS surveys sampled nationally representative populations, were conducted by the same organization (New ERA Ltd.), and managed by the same core group of survey personnel.

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  • For the analysis of biological samples two blood samples were taken, one with 5 ml heparin for the determination of acetyl cholinesterase (AChE) and pseudo cholinesterase (PChE) by the technique of Michel and Aldrige (Vorhaus and Kark, 1953) and another of 5 ml without anticoagulant for the analysis of OC pesticides in serum.

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  • The initial survey showed a high level of spatial heterogeneity in the location of industries in Jepara. For subsequent sampling and more detailed analysis of a subset of these enterprises, the area was divided into squares, each of which would be independently surveyed. The theoretical optimal size of the squares was calculated using the standard interpolation method, with weighted distances. Details are given in Annex 1 and the resulting grid is illustrated in Figure 2. The spatial heterogeneity is so extreme that 80% of the workshops are located in only 17% of the squares.

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  • Each household member records spending for the same two diary weeks, so we must pool observations across households to study expenditures over an entire month. Given that distance from payday is orthogonal to household characteristics, this pooling should not bias our estimate of the relationship between distance and spending.8 We impose a number of sample restrictions. People paid weekly are excluded, because every diary week includes a payday for these individuals.

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  • The industry outlook for retail sales of books and magazines in British Columbia is quite positive. Projections made by the Retail Council of Canada, the Book Industry Study Group and the Magazine and Bookseller Journal indicate that book sales will increase by 20% to 30% over the next three years. As in the past, mass market paperbacks written by well known authors will continue to provide the major impetus for growth. While it does not significantly affect Brian's Book Barn, major bookstore chains are expanding their operations and moving into new markets. U.S.

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  • There are currently no other bookstores in the greater Ladbrokes area. The closest major bookstore is in Prince George, a five hour drive away. The main competition for book and magazine sales would be Jack and Jill's Grocery, the local 7-11 store and, to a limited extent, gas station convenience stores in the greater Ladbrokes area. None of these competitors devote more than 100 square feet of space to book and magazine sales or carry more than 70 different magazine titles.

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  • The Modular Wetlands device to be tested is located in a non typical situation. Unlike a storm event that typically contains higher concentration during the first 2 hours our site has a fairly consistent flow of wash water that is estimated to be consistent through out the day. For this reason, composite samples were taken over a two hour period. The intent of the sampling was to establish a composite pollutant sample. This was done by dividing all of the containers and bottles to be filled for testing into ten equal parts. The grab sample was taken...

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  • In classification, we wish to construct a model from a set of historical data. The model should describe a predetermined set of data classes. For example, in traditional direct marketing there are usually two predetermined classes, namely the “responder” class and the “non-responder” class. An observation or sample is a record representing an entity, e.g. a customer. Each observation is associated with a certain number of characteristic attributes and belongs to exactly one of the predetermined classes.

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  • Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa học đề tài : Differences in demographic composition and in work, social, and functional limitations among the populations with unipolar depression and bipolar disorder: results from a nationally representative sample

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  • A sample of 200 consumers was drawn randomly from rural and urban locations in the two main regions of the Eastern Cape, namely the former Transkei homeland area and the former Ciskei homeland area. By means of structured questionnaires, the respondents were interviewed in relation to where they buy their groceries from, the types of foods they bought, their present and future buying patterns, preferred food products, and their reasons for choice of particular food products.

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  • Based on these simple descriptive statistics, banking appears to have been a relatively safe and, correspondingly, low return industry during our sample period. This matches the earlier finding by Flannery et al. (2004) that banks may simply be “boring”. Banks’ leverage is, however, substantially different from that of firms. Banks’ median book leverage is 92.6% and median market leverage is 87.3% while median book and market leverage of non- financial companies in Frank and Goyal (2004) is 24% and 23%, respectively.

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